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Semi active hydropneumatic spring and damper system

2019-11-19 22:36

Semiactive hydropneumatic spring and damper system ABSTRACT The basic concept of land vehicle transportation has not changed much in the last few decades, although much progress was made in improving and optimising vehicle design and technology.This paper is concerned with the development of a semiactive hydropneumatic spring and damper system, comprising of a two state hydropneumatic spring and a two state hydraulic damper. The system was specifically developed to improve the ride comfort and handling of large offroad vehicles. semi active hydropneumatic spring and damper system

The standard coil spring and viscous damper suspension system has been replaced with an alterable hydropneumatic semiactive suspension system called the 4state semi active suspension system

The aim of the study was to determine the best spring and damper characteristics for ride comfort and handlingstability respectively. These characteristics will be used to design a semiactive, hydropneumatic springdamper, able to switch both spring and damper characteristics electronically between discrete values. suspension unit comprising a twostage, semiactive, hydropneumatic spring, combined with a twostage semiactive damper, for an offroad vehicle as typically used by the military. Although the concept of a twostage spring is not new, no mathematical models of similar systems have been found in the literature. Furthermore, existing systems are all semi active hydropneumatic spring and damper system The two technologies complement each other particularly well. The air spring is used to adjust ride height and the Active Shock damper is used to compensate for the change in payload and natural frequency. The dampers can be integrated with an air ride system or converted to a hydro pneumatic damper for ride height control and compensation.

The hydropneumatic suspension uses highpressure nitrogen gas and an integral oil damper and provides for an easy path to ride height and wheel station load adjustment. Compact and providing excellent ride this is a superior selection for 4x4, 6x6 and 8x8 vehicles compared to coil or leaf spring, conventional shocks or air bag technology. semi active hydropneumatic spring and damper system The structure of a heavy vehicle semiactive hydropneumatic suspension system is shown in Figure 1, which shows a two degree of freedom system that represents a model of quarter car. The system consists of two parts, a passive pneumatic suspension and control systems. This paper is concerned with the development of a semiactive hydropneumatic spring and damper system, comprising of a two state hydropneumatic spring and a two state hydraulic damper. Active suspension is a type of automotive suspension that controls the vertical movement of the wheels relative to the chassis or vehicle body with an onboard system, rather than in passive suspension where the movement is being determined entirely by the road surface. Active suspensions can be generally divided into two classes: pure active suspensions, and adaptivesemiactive suspensions. Semiactive hydropneumatic spring and damper system C. L. Giliomee, P. S. Els Reumech Ermetek, PO Box 8323, Elandsfontein 1406, South Africa Abstract This paper is concerned

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